Over the past couple of weeks (prior to the Dec update), I have notice some strange battery related issues with my SP2. First, I started noticing that when the battery was fully charged, the battery level indicator would not change until it dropped to 97%. Sometimes it briefly showed 99% or 98% but then jumped back to 100%. In HwInfo64, the remaining capacity did not decrease until hitting 97% and then it dropped by what appeared to be the correct amount. Secondly, my SP2 seems to want to hibernate when the battery hits 9%. I can wake it up but it will spontaneously hibernate again in a few minutes. My SP2 is set to hibernate when the battery reaches 5%. I changed this to 3% and it seemed to hibernate at 6%. Thirdly, my battery level indicator seems to like to reset to 100%. I could be at 75% when I put it to sleep, but the next time it wakes up it may say it is at 100%. This is one issue that seem rather prevalent. I have read about holding the "volume +" and power button. While this worked to restore the proper capacity, a few days latter the problem returned. And now for the weirdest issue. My battery indicator will drop from 25% to 21%. I even logged this behavior with hwinfo. The remaining capacity instantaneously dropped from about 10,000mWh to 8700mWh. The same thing also happens when charging - a jump from about 8700mWh to 10,000mWh. It is bad enough that after about two months my rated capacity has dropped nearly 2500mWh, but now there is a 1300mWh "hole" in my battery...:shocked: I will probably try and pursue a replacement with MS after the holidays. My SP2 also has developed a case of CSS (Crunchy Screen Syndrome)...:disappointed: I do like the Surface and bought the SP2 (256GB) as a result of my positive experience with the SP1.